Telephone-transmitter.



nu. 663,702. Patented Feb. 2s, 90s.

D. H. WILSON. TELEPHONE TRANSMITTER.

(Appeacion med Apr. 29, 1899.)

(No Model.)

me mams PETERS co.. Puoumo., wnsmmron, u. c.

ED STATES PATENT OFFICE.

DAVID II. WILSON, OF CHICAGO, ILLINOIS, ASSIGNOR TO JAY MORTON, OF

' SAME PLACE.

TELEPHONE-TRANSMITTER.

SPECIFICATION forming part of Letters Patent No. 668,702, dated February 26, 1901. Application led April 29, 1899- Serial No. 714,940. (No model.)

T a/ZZ whom it may @0W/067%: surface of the carbon granules in the cup,

Beit known that I, DAVID H. WILSON, a but only makes contact with those exposed citizen of the United States, residing at Chithrough the opening D in the guard D. This cago, in the county of Cook and State of Iilicontact with the carbon granules connects 55 nois, have invented a certain new and useful the diaphragm through the carbon-holder and Improvement in Telephone-Transmitters, of the projecting part C3 with the terminal F.

which the following is a specilication. The diaphragm is also in contact with the My invention relates to telephone-transouter holder A, which forms the other termitters, and has for its object to provide a minal, by means of which the transmitter is 6o Io new and improved transmitter of this deconnected in circuit. The carbon cup or scription. holder C is not rigidly mounted in the part My invention is illustrated in the accom- A, but is elastically mounted therein. This panying drawings, whereinresult is obtained by forming the parts so that Figure l is aside View of a transmitter emthe projecting part C3 is free to reciprocate 65 bodying my invention, the transmitter being in the guide C4. I provide the spring G, attached to a movable arm. Fig. 2 is a secthe rear portion of the carbon-holder being tion through the transmitter. Fig. 3 is a secformed with a projection C9, about which the tion on line 3 3, Fig. 2. spring G is coiled. An insulating-washer G2 Like letters refer to like parts throughout receives the lower end of the spring, so as zo the several gures. to prevent said spring from making contact Referring now to the drawings, a suitable with the outer holder A. Some suitable outer cup or holder A is provided with a cap means is provided for adjusting the carbon- B, to which is attached the mouthpiece B. holder with relation to the diaphragm. As Contained within the outer holder isacarbonherein shown, the projecting part C3 is z5 holder C,fllled with granulated carbon. This threaded at its end and is provided with the carbon-holder has an enlarged opening C for nut C10, which engages the guide C4. By roreceiving the carbon, the holder being retating this nut in one direction the carbon'- cessed at C2, so as to make the carhon-opencup can be moved backward against the presing deeper at this point. The carbon-holder sure of the spring G, While by rotating the 8o 3o is provided with the projecting part C3, which nut in the other direction the spring pushes projects through the holder A, as shown, said the carbon-cup forward. projecting part working in the guide C4, said It will thus be seen that any desired adjustguide being insulated from the holder A by ment of the parts can be obtained and that the bushing C5. The carbon-holder is also during this adjustment there is no rotation 85 provided with means for preventing the roof either the carbon-cup or the diaphragm,

tation of the part C3 in the guide C4. In case the adjustment being entirely produced by a the part C3 is circular, some exterior means reciprocation of the carbon-cup. This prefor this purpose must be used-as, for exvents the granules from becoming crushed or ample, the pin C7, attached to the carbonpowdered, and thus obviates the many evil 9o 4o holder and working in the opening C8 in the results due to the powdered carbon-such, for insulating-bushing. Instead of leaving the example, as the packing of the granules and carbon-cup open I provide a guard D there the short-circuiting of the carbon-holder and for, which is attached to the cup in any dethe outer cup by the powdered carbon. The siredmanner and which is provided with a fact that the carbon-holder is elastically sus- 95 V central opening D. This openingis beveled, pended also reduces the tendency of the caras shown in Fig. 2. Between the mouthbon granules to pack and enables me to propiece B and the guard D of the carbon-cup duce much better results than can be prois a diaphragm E, of any desired conducting duced with the ordinary transmitter. material-such as metal, carbon, and the like. I have described in detail a particular con- 10o 5o I prefer to use a carbon diaphragm. This diastruction embodying my invention; butit is of phragm does not make contact with the Whole course evident that the parts may be varied in form, construction, and arrangement without departing from the spirit ot my invention, and I therefore do not wish to be limited to the construction shown.

In adjusting the transmitter it is very desirable to provide a construction which prevents the carbon-holder from being withdrawn far enough from the diaphragm during the adjustment to permit the carbon granules to escape from the carbon-holder, so as to fall between the diaphragln and the carbon-holder or the carbon-holder and the outer holder, thus short-circuiring the instrument. Any desired construction for this purpose maybe used, and, as herein shown, I have provided a stop or limiting device H, attached to the projecting part C3, said stop or limiting device engaging the insulating-washer G2, so as to stop the backward movement of the carbonholder before the space between the guard D and the diaphragm E is suicient to permit the escape of the granules.

I claiml. A transmitter, comprising a carbonholder formed with an opening of greater depth at the center than at the edges, a diaphragm mounted in proximity thereto, a guard between the carbon in the holder and the diaphragm, said guard provided with a central opening, through which the carbon is exposed so as to make contact with the diaphragm, said opening beveled from the face inwardly so as to vary in cross-section and being located opposite the deep part of the carbon-holder.

2. A transmitter, comprising a suitable diaphragm adapted to be setin vibration by the action of the voice, a carbon-holder mounted in proximity to said diaphragm, the parts so arranged that the resistance between the diaphragm and the carbon in said carbon-holder is varied as the diaphragm vibrates, said carbon-holder elastically mounted so as -to be normally forced toward the diaphragm, a suitable stationary guide in which said carbonholder is mounted and adapted to reciprocate, and means for reciprocating said carbonholder so as to adjust the transmitter.

Atransmitter, comprising an outer holder, a diaphragm mounted therein, a carbonholder within said outer holder and in proximity to said diaphragm, aspring normally tending to force said carbon-holder toward the diaphragm, and means for moving said carbon-holder with relation to said diaphragm to adjust the transmitter.

4t. A transmitter, comprising an outer holder, a diaphragm mounted therein, a carbonholder Within said outer holder and in proximity to said diaphragm, a spring normally tending to force said carbon-holder toward the diaphragm, a device for holding said carbon-holder so as to prevent rotation of the same, and means for reciprocating said carbon-holder so as to vary its position with relation to the diaphragm.

5. A transmitter, comprising an outer holder, a diaphragm mounted therein, a carbonholder within said outer holder and in proximity to said diaphragm, a spring normally tending to force said carbon-holder toward the diaphragm, means for moving said carbon-holder with relation to said diaphragm to adjust the transmitter, a guide by which said carbon-holder is supported, said guide connected with said outer holder, but insulated therefrom, a nut connected with said carbon-holder and adapted to bear against said guide so that the tension ot' the spring may be varied and the parts adjusted by rotating said nut.

6. A transmitter, comprising an outer holder, a diaphragm mounted therein, a carbonholder within said outer holder and in proximity to said diaphragm, said carbon-holder provided at its rear with a projection smaller in diameter than the main part of the holder, a spring interposed between the carbon-holder and the outer holder, said spring surrounding said projection, a projecting part connected with the carbon-holder, a guide connected with the outer holder, through which said projecting part extends, and means for reciprocating said projecting part so as to move the carbon-holder with relation to the diaphragm.

7. A transmitter, comprising an onterholder, a diaphragm mounted therein, a carbonholder within said outer holder and in proximity to vsaid diaphragm, said carbon-holder provided at its rear with a projection smaller in diameter than the main part of the holder, a spring interposed between the carbon-holder and the outer holder, said spring surrounding said projection, a projecting part connected with the carbon-holder, a guide connected with the outer holder, through which said projecting part extends, means for reciprocating said projecting part so as to move the carbon-holder with relation to the diaph ragm, and a device for preventing rotation of the carbon-holder while it is being moved.

8. A transmitter, comprising a carbon-holder, a diaphragm mounted in proximity thereto so as to engage the surface of the carbon in the carbon-holder, means for moving said carbon-holder and diaphragm with relation to each other so as to adj ust the instrument, and a stop for limiting the rclative movement between them before they are separated a suiiicient amount to permit the escape of the carbon from the carbon-holder.

9. A transmitter, comprising an outer holder, a diaphragm mounted therein, a carbonholder movably mounted in the outer holder and in proximity to the diaphragm, a guard associated with said carbon-holder and provided with a central opening through which the carbon is exposed and makes contact with the diaphragm, a spring normally tending to force the carbon-holder toward the diaphragm, and means for stopping the backward movement of the carbon-holder before said carbon-holder becomes separated from the dia- IOO IZO

phragm a sueient amount to permit the carbon to pass between the diaphragm and the guard.

10. A transmitter,oomprisingan outer holder, a diaphragm mounted therein, a carbonholder Within said outer holder and in proximit)7 to said diaphragm, a guard removably attached to the face of said carbon-holder and provided With a central opening, a spring associated with said carbon-holder and tendzo ing to force it bodily toward said diaphragm, and means for moving said carbon-holder against the pressure of said spring, substantially as described.

DAVID H. WILSON. Witnesses:

DONALD M. CARTER, HoMER L. KRAFT. 

